Crystallisation studies on site saturated lithium aluminosilicate (LAS) glass

被引：17

作者：

Venkateswaran, C. ^{[1
]}

Sharma, S. C. ^{[1
]}

Pant, Bhanu ^{[1
]}

Chauhan, V. S. ^{[2
]}

Vaish, Rahul ^{[2
]}

机构：

[1] ISRO, Vikram Sarabhai Space Ctr, Thiruvananthapuram, Kerala, India

[2] Indian Inst Technol, Sch Engn, Mandi, Himachal Prades, India

来源：

THERMOCHIMICA ACTA | 2019年 / 679卷

关键词：

Crystallisation; Aluminosilicate; Low expansion; Glass-ceramic; DIFFERENTIAL THERMAL-ANALYSIS; TRANSITION TEMPERATURE; KINETICS; NUCLEATION; CERAMICS; FLUORINE; TRANSFORMATIONS; MICROSTRUCTURE;

D O I：

10.1016/j.tca.2019.178311

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Available sites for nucleation has to reach saturated condition that is a primary validity criterion for employing conventional thermo-analytical (TA) methods. Non-isothermal DSC and TA methods were employed to determine the crystallisation parameters of site-saturated lithium aluminosilicate (LAS) glass. Activation energy of crystallisation for a thermally stable LAS composition was determined after prenucleation process and it was found to be 371 +/- 14 kJ/mol. A heat treatment programme for controlled crystallisation process was designed to result a transparent ( > 80%), nanocrystalline, low expansion (coefficient of thermal expansion - 0.31 ppm/K between - 60 to + 60 degrees C) glass-ceramic. Crystal growth at 1048 K was determined to be in range 2.56-3.53 x 10(-11) m/s and viscosity of glass near the growth front was predicted to vary between 1.28 x 10(5) and 2.82 x 105N s m(-2).

引用

页数：9

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